Fujitsu AB Series A18LATN, Service Instruction

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Attention
Trouble shooting 34
Forecast of Cause:
Check Point 2 : Check Outdoor Unit Operation
Check Point 1 : Check Indoor Unit
Check Point 3 : Check Site Condition
Check Point 5 : Check Refrigeration Cycle
Check Point 4 :
Check Indoor/ Outdoor Installation Condition
Pipe (In) Pipe (Out)
Pipe (In) Pipe (Out)
OK OK
OK OK
OK OK
OK OK
MPa MPa
No Cooling / No Heating
1. Indoor Unit error 2. Outdoor Unit error
3. Effect by Surrounding environment
4. Connection Pipe / Connection Wire failure 5. Refrigeration cycle failure
Does Indoor Unit FAN run on HIGH FAN?
Is Air Filter dirty?
Is Heat Exchanger clogged?
Check if Energy save function is operated.
Check if Outdoor Unit is operating
(If not, refer to Trouble shooting 32)
Check any objects that obstruct the air flow route.
Check clogged Heat Exchanger.
Is the Valve open?
Is capacity of Indoor Unit fitted to Room size?
Any windows open? Or direct sunlight ?
Check connection pipe
(specified pipe length & Pipe diameter?)
Check any loose or removed communication line.
>> If there is an abnormal condition, correct it by
referring to Installation Manual or Data & Technical
Manual.
Check if Strainer is clogged (Refer to the figure at right).
Measure Gas Pressure and if there is a leakage, correct it.
>> When recharging the refrigerant, make sure to perform
vacuuming, and recharge the specified amount.
Check EEV (PARTS INFORMATION 4)
Check Compressor (PARTS INFORMATION 1,2)
Strainer normally does not have temperature difference
between inlet and outlet as shown in , but if there is a
difference like shown in , there is a possibility of inside
clogged. In this case, replace Strainer.
07-35